Drill-grinding attachment.



M. WAGNER.

DRILL GRINDING ATTACHMENT.

APPLICATION FILED I'EBl15, 1913.

A m ow u A d 6 W u P W n m H 1 E S V 1 mi, \MQ

INVENTOR Airy).

WITNESSES I citizen of the United States, residing at,

UNITED sTATEs ATENT OFFICE.

MICHAEL \VAGNER, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR, BY MESNE ASSIGN- MENTS, '10 SAMUEL S. NEWMAN, OF PITTSBURGH, YENNSYLVANIA.

DRILL-GRINDING ATTACHMENT.

To all whom it may concern Be 1t known that I, Mioirani. WAGNER, a

Pittsburgh, in the county oi Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in'Drill- Grinding Attachments, or" which the following is a pecification.

The invention relates to grinding attachments for grinding the ends of drills, and pwticularly twist drills.

The invention has for its primary objects; the provision of an improved and simplified attachment whereby the grinding of the drill point may be accomplished upon the edge surface of a grinding wheel as opposed to the side surface of the wheel as is ordinarily don and the provision of an attachment which provides for adjustments to suit various sizes of drills and drills having their end cutting faces at various angles.

One embodiment of the invention is illustrated in the accompanying drawings, wherein- I Figure l is a plan view of a grinding machine with my attachment applied thereto; Fig. 2 is a side elevation of the mechanism of Fig. 1; Fig. 3 is an end view of the carrier or trough which supports the drill; Fig. 4. is a partial side elevation of the to tary adjusting means; Fig. 5 a plan view of the supporting bracket employed, with the other parts detachedtherefrom; Fig. t) is a side elevation of the attachment employed with the carrier when a drill of unusual lcngth is to be supported in the carrier; Fig. 7 i a section on the line VI IVII of Fig. 6, and F ig. 8 is a section on the line VIII-VIII of Fig. 1.

The grinding mechanism to which the attachment is applicable may be of any desired type, but preferably consists of a disk grinding wheel 1 driven from the handle or any other desired means, by means of gears carried in the casing 3. The casing 3 s provided with a socket 4 into which tits the arm of the supporting bracket 5. such arm being held in fixed position by means of a screw The free end of the bracket or support. 5 provided with a cylindrical member 7 (Fig. 5). and upon this cylindrical member 7 fits another cylindrical member 8 provided with a stud t) (Fig. '2) which extends through the member 7. the parts being held securely in position by means of Specification of Letters Patent.

the wing nut 10. The face of the member 7 is provided with the plurality of notches 11 adapted to cooperate with a tooth 12 car ried by the lower face of the member 8 (Fig. 1), sothat after the parts 7 and 8 are secured by mean of the wing nut they are prevented by the engagement of the notches and the tooth from rotating relatively.

Integral with the upper end of the memher 8 .is a hub portion 13 (Figs. 1 and 8) and in this hub is mounted a sleeve 14 provided with a handle 15 for giving the sleeve a rotary adjustment. Mounted rotatably in the sleeve is What may be termed a pivot rod 16, which pivot rod is placed eccentrically with respect to the axis of the sleeve 14 and i provided at its end with a reduced portion 17. The reduced portion 17 fits into a block 18 (Fig. 1), which constitutes a part of the drill carrier, and is held in such position by means of set screw 19. The drill carrier comprises the block 18 and a trough shaped portion 20 in which lies the drill 21 to be ground.

The drill 21 is clamped in position in the trough by means of a clam 22 (Figs. 1 and 3), which clamp is pivote at its outer end to an arm 23 secured to the trough, and at its inner end bears against the surface of the drill. A screw 24 provided with a wing nut- 25 serves to clamp the inner end of the arm 22 firmly against the drill 21. The longitudinal position of the drill in the trough 20 is adjusted by means of the loop 26, which loop is held in position upon the trough by means of a set screw 27. Another set screw 28 (Fig. 1) extending ang'ularly through the upper portion of the loop 26 serves to engage the rear end of the drill.

When it is desired to grind a drill longer than the carrier trough 20, the means shown in Figs. 6 and 7 are employed to secure an extension of such trough. In this arrangement the loop 26 of Fig. 1 is replaced by a loop 29 held in position by the set screw 30, and a bar 31 is extended through the loop 32 at the end of the trough 20. This bar has an upturned end 33 carrying the screw 31 for engaging'the rear end of the drill 21.

In order to secure an adjustment of the block 18 toward and from the surface of the grinding wheel the additional holes and 36 (Fig. 1) are provided in the block 18, which holes are adapted to receive the Patented Aug. 11, 1914.

Application filed February 15, 1913. Serial No. 748,536.

reduced end 17 of the pivot rod 16. By this means the radius upon which the point of the drill swings may be varied to suit the size of drill. lVhen it is desired to change the angle of grinding of the drill, the member 8 (Fig. 2) is rotated about its vertical axis 9 the desired amount, graduation marks corresponding to different angles of grinding being provided upon the member 8, while a pointer 37 is provided upon the member 7. A portion of the end of the sleeve 14 is cut away as indicated at 38 and 39 (Fig. 2), providing shoulders 40 and 41 for engagement with a stop 42, so that the amount of rotation of the sleeve 14 in both directions is limited.

In operation a drill 21 is placed in the trough 20 and moved along therein until its edge barely touches the periphery of the grinding wheel as such wheel rotates, and is securely held in such position by means of the clamp 22 and the set screw 28 at the rear end of the drill. The trough is then given a succession of rocking movements, the handle 15 of the eccentric sleeve 14 being given a slight movement toward the left after each oscillation. The end of the drill is thus gradually advanced toward the grinding wheel by the step-by-step rotation of the eccentric sleeve 14. This is continued until the drill has been ground the required amount, when the clamp 22 and the screw 28 are withdrawn to permit the drill to be turned over to grind its other edge, the operation as heretofore described being then repeated. If a drill of a different angle is to be ground the wing nut 10 (Fig. 2) is relieved and the member 8 rotated about its vertical axis until the required degree comes opposite the pointer 37 after which the wing nut is locked. If a drill of larger diameter is to be ground the pivot pin 16 will be removed from the position shown in Fig. 1, and its reduced inner end I? placed in one of the holes or 36, thus increasing the radius of swing of the end of the drill. The lip 43 on the block 18 engages the drill chan nel and fixes the position of the drill rotarily so that the surface to be ground is properly positioned with respect to the wheel. This insures the proper clearance at the cutting edge of the drill. The position of the lip depends upon the position of the axis 16 and must be accurately determined. The various advantages incident to grinding upon the edge surface of the grinding wheel rather than upon the side surface as has heretofore been done, and the advantages incident to the various adjustments of the apparatus whereby it may be used with a wide variety of drills of different angles and different sizes will be readily apparent to those skilled in the art.

Having thus described my invention and illustrated its use, what I claim as new and desire to secure by Letters Patent, is the following:

1. In combination in an attachment for use with a disk grinding wheel, a support for the attachment, a drill carrier provided with a supporting axis extending transversely to the plane of rotation of the grinding wheel, a member in which the said axis is journaled and which is mounted upon the said support for movement with respect thereto, and positive means for adjusting the said member to move the drill carrier and drill toward the axis of rotation of the wheel as the grinding progresses and intermediate the oscillations of the carrier upon its axis.

2. In combination in an attachment for use with a disk grinding wheel, a support for the attachment, a drill carrier mounted rotatably on the support on an axis trans verse to the plane of rotation of the grinding wheel and positioned so as to bring the drill in engagement with the edge surface of the wheel, and means for adjusting the axis of rotation of the drill carrier with respect to the said support and toward the wheel as the grinding progresses.

8. In combination in an attachment for use with a disk grindin wheel, a support for the attachment, a drill carrier mounted rotatably on the support on an axis transverse to the plane of rotation of the grinding wheel and positioned so as to bring the drill in engagement with the edge surface of the wheel, and an eccentric for adjusting the drill carrier toward the wheel as the grinding progresses.

4. In combination in an attachment for use with a disk grinding wheel, a support for the attachment, a drill carrier mounted rotatably on the support on an axis transverse to the plane of rotation of the grinding wheel and positioned so as to bring the drill in engagement with the edge surface of the wheel, and means whereby the axis of rotation of the drill carrier may be adjusted toward and from the edge surface of the wheel to change the radius of swing of the end of drill and provide for the grinding of drills of difierent sizes.

5. In combination in a drill carrier for a grinding machine, a trough for supporting the drill, provided at its rear lower portion with a loop, means for clamping the drill in the trough, a positioning bar for the rear end of the drill extending slidably through the said loop and lying beneath the trough and a. removable loop fitting around the trough and bar and provided with a holding screw engaging the said bar.

6. In combination in an attachment for use with a disk grinding wheel, a support for the attachment, a drill carrier, a pivot rod supporting the carrier and extending transversely to the plane of rotation of the grind ing wheel, a sleeve mounted on the support ISO and carrying eccentrically,therein the said pivot rod, and means for rotating the said sleeve, the drill carrier being so positioned as to bring the drill in engagement with the edge surface of the drill, the said pivot rod being slidable longitudinally of the said sleeve.

7. In combination in an attachment for use with a disk grinding wheel, a support for the attachment, a rotatable sleeve mounted on the support, a pivot rod mounted eccentrically in the sleeve and slidable longitudinally thereof, means for rotating the sleeve and a drill carrier carried by the said pivot rod and adjustable toward and from the grinding wheel by the said sleeve.

8. In combination in an attachment for use with a disk grinding wheel, a support for theattachemnt, a drill carrier rotatably mounted on the support, means for moving the carrier toward and from the grinding wheel, and means whereby the axis of rotation of the drill carrier may be shifted about a vertical axis to provide for the grinding of drills of diiferent angles.

9. In combination in an attachment for use with a disk grinding wheel, a support for the attachment, a drill 'rotatably mounted on the support, means for moving the carrier toward and from the grinding wheel, and other means whereby the axis of rotation of the drill carrier may be adjusted toward and from the wheel to change the radius ,of swing of the end of the drill and provide for the grinding of drills of different sizes.

10. In con'ibination in an attachment for use with a disk ,grinding wheel, a support for the attachment, a drill carrier mounted on an axis transverse to the plane of rotation of the wheel and also mounted for movement transverse to the edge of the wheel so that the end of the drill may be moved up and down in the plane of rotai to the plane of rotation of the grinding wheel, a member in which the said pin is journaled and from which it is free to be removed by an endwise movement of the pin, the said member being mounted upon the said support for movement with respect thereto, and positive means for adjusting the said member to move the carrier and drill toward the axis of rotation of the grinding wheel as the grinding progresses and intermediate the oscillations of the carrier upon its pin.

In testimony whereof I have hereunto signed my name in the" presence of the two subscribed witnesses.

MICHAEL WAGNER. 

